Carlos Carvalhal felt Wednesday deserved to return with three points from their 1-0 defeat at Birmingham.
The players were booed off by some of the travelling fans after a second successive reverse but Carvalhal said: “We should have won this game. We had 17 attempts on goal, 62 per cent possession and a goal disallowed that, in my opinion, was legitimate.
“Birmingham’s goal was also very tight and this is the way that football can go sometimes.”
Reflecting on a second loss within four days, Carvalhal added: “So is this the most demanding period so far? Of course. But only two games ago we lose just one game in seven.
“We have now lost two games in a few days so of course no one will be happy. I am not happy, the players are not happy, the fans are not happy.
“We have a very important game on Sunday and we need the help of the fans at Hillsborough.”